Huangbanjigou, Chaomidian Village, CNU 2015 collection (Cretaceous of China)

Where: Liaoning, China (41.6° N, 120.8° E: paleocoordinates 44.1° N, 122.9° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Yixian Formation, Late/Upper Barremian (130.0 - 125.5 Ma)

• The Yixian Formation can be subdivided into five units, in ascending order, Lujiatun unit, Lower Lava, Jianshangou unit, Upper Lava, Dawangzhangzi unit, Jingangshan unit, and Huanghuashan unit. Most of the Jehol fossils from the Yixian Formation are preserved in four beds, that is, the Lujiatun bed (recalculated age is 124.0 ± 1.0/1.3 Ma, He et al., 2006), the Jianshangou bed (125.43 ± 0.50/0.88 Ma, Swisher et al., 1999), the Dawangzhangzi bed, and Jinggangshan bed (~122 Ma, Smith et al., 1995).U-Pb dating suggests that the Huangbanjigou section ranges from 124.9 ± 1.7 Ma to 122.8 ± 1.6 Ma (Yang et al., 2007). Chang et al. (2017) obtained Ar/Ar ages of 125.8 ± 1.0 Ma and 126.0 ± 0.8 Ma from the Lujiatun Unit, the lowest part of the Yixian Formation, below the lacustrine shales.

•He et al. (2004) reported a 40Ar/39Ar age of 120.3 ± 0.7 Ma for a tuff layer in the lower part of the Jiufotang Formation, and Chang et al. (2009) obtained a 40Ar/39Ar age of 122.1 ± 0.3 Ma for a tuff layer from the lowermost part of the Jiufotang Formation. Yu et al. (2021) dated an ash bed just above the Yixian/Jiufotang formation boundary to 122.0 ± 0.9 Ma and three tuff beds from the Xiaotaizi section to 118.9 ± 0.8 Ma, 118.8 ± 0.6 Ma, and 118.6 ± 1.1 Ma. These ages suggest that the Jiufotang Formation in Jianchang Basin was deposited at ca. 122.0–118.9 Ma.

•Olierrok et al. (2019) used a selection of U-Pb and 40Ar-39Ar geochronology to place the Barremian–Aptian boundary (the base of the Chron M0r) between 123.8 and 121.8 Ma. The GTS 2020 uses an age of 121.4 Ma for the base of the Aptian, and multiproxy orbital tuning gives an age of 120.2 Ma for the Barremian-Aptian boundary (Leandro et al., 2022). Therefore, the Yixian Formation should be entirely Late Barremian, with the Jiufotang Formation deposited in the Early Aptian (or latest Barremian at its base).

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified, tuffaceous mudstone

Size classes: macrofossils, mesofossils

Preservation: adpression

Collection methods: Repository: Capital Normal University, Beijing

Primary reference: L. C. Guo, C. K. Shih, L. F. Li and D. Ren. 2016. New pelecinid wasps (Hymenoptera: Pelecinidae) from the Yixian Formation of western Liaoning, China. Cretaceous Research 61:151-160 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 176345: authorized by Matthew Clapham, entered by Matthew Clapham on 08.02.2016

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Neuroptera - Ithonidae
Lasiosmylus longus n. sp.4 Zheng et al. 2016 moth lacewing
CNU-NEU-LB2015003
Lasiosmylus newi4 Ren and Guo 1996 moth lacewing
CNU-NEU-LB2015001, 002
 Hymenoptera - Evaniidae
Cretevania mitis1 Li et al. 2014 ensign wasp
CNU-HYM-LB-2015001
Cretevania venae n. sp.1 Li et al. 2018 ensign wasp
CNU-HYM-LB-2015002
 Hymenoptera - Baissidae
Mesepipolaea parva n. sp.2, Heterobaissa apetiola n. gen. n. sp.1, Manlaya magna n. sp.2, Manlaya ultima n. sp.2, Manlaya proba n. sp.2
Mesepipolaea parva n. sp.2 Li et al. 2019 wasp
CNU-HYM-LB-2015007
Heterobaissa apetiola n. gen. n. sp.1 Li et al. 2018 wasp
CNU-HYM-LB-2015003
Manlaya magna n. sp.2 Li et al. 2019 wasp
CNU-HYM-LB-2015005
Manlaya ultima n. sp.2 Li et al. 2019 wasp
CNU-HYM-LB-2015006
Manlaya proba n. sp.2 Li et al. 2019 wasp
CNU-HYM-LB-2015004
 Hymenoptera - Pelecinidae
Stelepelecinus longus n. gen. n. sp.
Stelepelecinus longus n. gen. n. sp. Guo et al. 2016 wasp
CNU-HYM-LB-2015093
 Dermaptera - Protodiplatyidae
Sinoprotodiplatys ellipsoideuata n. sp.3, "Barbderma oblonguata n. gen. n. sp." = Barbderma oblonguatum3
Sinoprotodiplatys ellipsoideuata n. sp.3 Xing et al. 2016 earwig
CNU-DER-LB2015003
"Barbderma oblonguata n. gen. n. sp." = Barbderma oblonguatum3 Xing et al. 2016 earwig
CNU-DER-LB2015001, 002